George r



(N Model.)

G. R. LEAN. ELECTRIC ARG LAMP. N0. 571,976. Patented Nov.. 24, 1896.

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llNiTEn STATES PATENT Erice.

GEORGE R. LEAN, OF CLEVELAND, OHIO, ASSIGNOR TO rlllE .TANDUS ELECTRIC COMPANY, OE SAME PLACE.

LECTRlC=ARC LANE P.

SPECFICATION forming part of Letters Patent No. 571,976, dated November 241, 1896.

Application iiled July 7, 1896. Serial No. 598,351. (No model.)

To all whom it may concern:

Beit known that I, GEORGE R. LEAN, a resident of Cleveland, in t-he county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Electric Arc Lamps; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in electric-arc lamps, and more particularly to such as employ an inner arc-inclosing globe and a large outer globe, the object of the invention being to provide simple and etiicient devices for holding these globes in such m anner that they will be normally retained in proper positions and so that they can be readily and quickly adjusted or removed to facilitate the trimming of the lamp.

A further object is to provide a simpleand efiicient cover for the arc-inclosing globe, adapted to accurately conform to irregularities of the upper carbon and to permit the escape of gas from the inner or arc-inclosing globe when the pressure therein becomes excessive.

A further object is to produce a simple and efficient holder for the lower carbon of an arc-lamp.

Vith these objects in view the invention consists in the combination, with. a depending arm and a yoke at the lower end of said arm, of an outer-globe holder removably connected to said yoke and an inner or arc-inclosing globe holder hinged to said arm above the yoke.

The invention further consists in the combination, with the frame of an arc-lamp, of an arm hinged thereto and globe-holder and a carbon-holder carried by said hinged arm.

The invention also consists in the combination,with an arc-inelosing globe,of a cover for said globe, comprising two parts, one part being adapted to rest upon the upper edge of the globe and to have a lateral movement thereon and the other part being adapted to rest upon the iirst-mentioi'ied part and to have a lateral movement thereon, both of said parts having holes for the passage of the upper carbon of the lamp.

'lhe invention also consists in certain novel features of construction and combinations and arrangement; of parts, as hereinafter set forth, and pointed out in the claims.

In the accompanying drawings, Figure l is a view, partly in section, illustrating myimproveniente. Fig. 2 is a view showing the outer globe lowered and the inner globe swung laterally to facilitate trimming the lamp. Fig. 3 is a detail sectional view showing the carbon-holder and innerglobe holder. Figs. gt and 5 are enlarged detail views of the cap or cover et the inner or arc-inclosing globe. Fig. 6 is a view of a modilication of said cap or cover.

A represents a portion ot' the upper framework of an electric-arc lamp, B the lower portion of the lamp-casing, and C the brushholder for the upper carbon of the lamp. The upper framework of the lamp supports a depending globe-irame D, which comprises a ring l, having a flange i), secured to the upper lamp-frame A, integral arms 3, depending from said ring, and a yoke or arm i, connecting the lower ends of the depending arms A ring 5, having a depending vflange (5, encircles the ring or ann ular portion l of irame D, and ,has an air-tight bearing against the same. A suitable packing is placed under the ring 5, and against this packing the upper edge of the outer globe S bears, being retained properly in engagement therewith by means of set-screws 9 passing through the flange G on said ring.

The lower end of the globe S is made with an opening through which a bar lO passes. A sleeve ll encircles and is insulated from a portion of the bar lO, and said sleeve is inclosed by a loose sleeve l2, having an external shoulder or enlargement o. A knob l) is mounted on the lower end of bar l0 and freely enters the lower end of the sleeve l2. A spring c is disposed within the sleeve l2 and bears at its respective ends against the upper end oi' knob banda vflange d at the upper end of sleeve l2.

A dished plate c, having an opening therein, encircles the sleeve l2 and bears at its lower edge against the shoulder or enlargement on said sleeve, the upper edge ot' said dished plate bearing against the under face oi' the globe S. The dished plate e is also made with an annular shoulder, ou which an asbestos ring j is disposed, and on said ring the lower edge of the globe rests.

The bar l2 is provided at a point between its ends with a flange lt, which serves as a rest or support for an annular disk l5, preferably screwed on said bar, the periphery ot said disk bearing against the inner face of the globe and constituting, with the part c, a means for locking or clamping the globe to the bar l2 and retaining the globe in proper position.

In order to prevent the displacement of the annular clamping-disk l5, it will be held in place by means of set-collars 17. The upper portion of the bar l2 (which may be made hollow) is provided at or near its upper eX- tremity with laterally -projecting pins 1S, adapted to pass through slots l) made in the inner wall of a hollow boss 20 between the ends of the arm or yoke l. Then the bar l2 shall have been thus passed up through the boss 20, the globe ring or collar 5 will bear, air-tight, against the ring l of the globeframe D.

A quarter-turn of the bar 1,2 will cause the pins 18 t-o enter notches 22 in the upper edge of the boss 20, and thus the outer globe S will be supported in position and will be normally air-tight both above and below. Should the pressure within the globe S become excessive, said globe will descend against the resistance of the spring c, when the gas can escape through the upper end of the globe.

The depending arms 3 of the globe-frameA are adapted to 'form guideways for guides 28, projecting inwardly from the globe ring or collar 5 at diametrieally opposite points. lVhen it is desired to lower the outer globe, it is simply necessary to turn the bar l2 so that the pins 1S will aline with the slots lt) in the boss 20. The bar l2 can then be withdrawn from the boss 2O and the globe will be guided in its downward movement by the guides \Vhen the guides 23 reach the lower ends of the arms 3, they will engage rings or stops itl, secured to said arms, and thus the globe will be supported in its lowered position.

One of the arms 3 of the globe-traine D is made with an inwardly-p rejecting' perforated lug 2G for the reception of a'hinge-pin 27, by means ol which an arm 28 is hinged to the frame, said hinge-pin passing through perforated bosses 2t S30 on one end of said arm. The bosses 30 are so arranged relatively to each other and to the lug 2O which enters between them that the arm 2S can have a slight vertical movement, whereby its tree end can be made to engage a tooth 3l on the opposite arm of the trame D or to be disengaged theretrom, said free end of the arm 2S being made with a recess 32 vfor the reception o'll the tooth 3l.

The arm 2S is made between its ends with an enlargement which constitutes a base for the holder of an arc-inclosing globe and also for the reception of the lower-carbon holder. The base of the inner-globe holder is made with a recess 25, in which a packingring 35 is placed for the reception of the lower edge of said inner globe. A cap or collar Clo is adapted to screw on the portion S7 ot the base E33 and is provided at its upper edge with an inwardly-projecting curved llange or annular lip 38. Above the annular screw-threaded portion 37 of the base S53 and within the curved lip orange 3S an annular coiled spring 30 is placed.

Vhen the lower end ol' the inner globe is seated on the packing-ring 35 and the cap 30 is screwed down, the curved Flange or lip 3S will cause the spring-ring 3f) to be contracted and bear on the shoulder l0 cit the globe, thus forcing the edge of the latter tightly against the packing-ring 35.

The base 33 is made with an opening All, extending entirely through the same, said opening having a tapering wall -12 at its upper end. 'Within the opening il a lower-carbon holder, made in the form of a split sleeve i3, is placed and provided with a tapering outer wall et near its upper end to bear against the tapering wall 42 of the openin ,tl. The lower end of the sleeve or holder -tl is screw-threaded and projects below the lower face of the base or enlargement 33. A nut is screwed on the screw-threaded end of the sleeve orholder-t and adapted to bear against the under t'ace of the base 33. From this construction and arrangement of parts it will be seen that when the nut is unscrewed or loosened the sleeve orholdcritb1 can be moved upwardly and allowed to expand for the reception ol' the lower carbon of the lamp. XVhen. the carbon shall have been placed in the sleeve or holder, the nut -l will be screwed up and the engagement ot the tapering wall of said sleeve with the tapering wall el the opening in the base will cause said sleeve to be contracted and tightened on the carbon, thus holding the latter firmly in proper position.

Then it is desired to trim the lamp, the outer globe will tirst be lowered in the lmanner above explained. lhe arm 2S will bc raised slightly, so as to release its free end, and then said arm will be swung out ot' the frame D, thus bringing the limer globe, its holder, and the lower-carbon holder in a convenient position to be manipulated bythe trimmer.

ln the type of lamp to which my invention relates it is important that the inner or arcinclosing globe be manipulated normally airtight. I have above explained how the globe is closed air-tight in its holder. The upper end ol' the inner or arc-inclosing globe is closed by means of a coverlfl. This cover comprises a dished plate t6, adapted to enter the upper end of the globe S-t, and having an annular shoulder -t to rest upon the upper edge of said globe and be capable of a lateral move- IOO IIO

ment thereon. From the outer edge of the annular shoulder 47 an upwardly and inwardly projecting flange 4S projects. A concave disk is disposed over the disk eid and rests at its periphery en the shoulder i7, immediately under the curved annular flange 4S, said concave disk 49 being of such diameter as to be permitted to have a lateral movement on the shoulder A f'. The plate ad and disk i9 are provided, respectively, with holes 50 5l, through which the upper carbon 52 of the lamp neatly passes.

By constructing and arranging the cap or cover for the inner er arc-inclosing globe in the manner above explained the carbon can pass snugly through both holes and still allow for irregularities in both the globe and the carbon. By making the dished plate il deep and the disk 49 concave the carbons can be more completely consumed than if the cap were flush with or above the top of the globe, the carbon-sheath being allowed to partially enter the globe before touching the cap. The dished plate 4G might, if desired, be made more shallow, and the disk Ll0 might be made convex, as shown in Fig. (3.

Various slight changes might be made in the details of construction of my invention without departing from the spirit thereof or limiting its scope, and hence I do not wish to limit myself to the precise details herein set forth.

I'Iavin g fully described my invention, what I claim as new, and desire to secure by Letters Patent, is"

l. In an arc-lamp, the combination with a depending arm, and a yoke at the lower end of said arm, of an outerglobe holder removably connected to said yoke, and an inner or arc-inclosing globe holder hinged to said arm above the yoke.

2. In an arc-lamp, the combination with two depending arms and a yoke connecting the lower ends of said arm-s, of an outer-globe holder removably connected to said yoke, an inner or arc-inclosing-globe holder hinged to one of said depending arms above the yoke and constructed to be locked to the other depending arm, substantially as set forth.

3. In an arc-lamp, the combination with depending arms, of a ring at the upper ends of said arms, a yoke at the lower ends of said arms, an outer-globe helder removably attached to said yoke, an outer globe, a cellar secured to the upper end of said globe and adapted to bear against said ring, and an inner-globe holder hinged between said depending arms above the yoke, substantially as set forth.

et. In an are-lamp, the combination with a frame, of an arm hinged at one end thereto, and a globe-holder and a carbon-holder carried by said hinged arm, substantially as set forth.

5. In an arc-lamp, the combination with a frame, of a globe-holder hinged thereto and a carbon-holder disposed within and carried by the globe-holder, substantially as set forth.

G. In an arc-lamp, the combination with a frame having depending arms, of an arm hinged at one end to one arm of the frame and adapted at its other end to engage a tooth or catch on the other arm of the frame, said hinged arm being adapted to support a globe-holder and a carbon-holder, substantially as set forth.

T. In an arc-lamp, the combination with a frame having depending arms, of an arm hinged to one of said arms of the frame so as to be capable of a vertical and a swinging movement, the free end of said hinged arm being adapted to engage and become locked to the other depending arm of the frame, substantially as set forth.

S. In an arc-lamp, the combination with a base having an opening therein, a portion of said opening being tapering, of a collapsible sleeve or holder in said opening and having a tapering portion to bear against the tapering portion of said opening, said sleeve or holder having a screw-threaded lower end adapted to project below said base, and a nut adapted to screw on said lower end of the sleeve or holder and bear against the lower face of said base, substantially as set forth.

9. The combination with an inner or arcinclosing globe, of a cover therefor comprising two pieces, one upon the other and both adapted to be permitted to have lateral motion, substantially as set forth.

l0. The combination with an inner or arciuclosin g globe, of a cover therefor, said cover comprising a dished plate adapted to enter the globe and having a shoulder to rest and have a lateral movement on the upper edge of the globe, and a disk adapted to rest and have a lateral movement on said shoulder, said plate and disk having alined openings for the passage of the upper carbon of the lamp, substantially as set forth.

Il. rI'he combination with an inner or arcinclosin g globe, of a cover made in two pieces, one piece being a dished plate having a perforation and adapted to be capable of lateral movement en the globe, and the other piece being a concave disk having a perforation and adapted to be supported by the dished plate so as to be capable of lateral movement, substantially as set forth.

l2. rIlhe combination with an inner or arcinclosing globo, of a cover comprising two pieces having alined pcrforations and adapted to have lateral movement relatively to the globe and relatively to each other, one of said pieces having an annular shoulder to rest on the globe and to receive the edge of the other piece, and a curved annular lip or flange projecting from the periphery of said shoulder and termin ati n g over the last-mentioned disk, substantially as set forth.

i3. In an arc-lamp, the combination with a frame and a movable bar depending there- ICO 

